P1637
CIRCUIT DESCRIPTIONOutput Driver Modules (ODMs) are used by the PCM to turn on many of the current-driven devices that are needed to control various engine and Transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding on. The PCM turns on the bulb, LED, or driver info center indicator by supplying a path to ground through the PCM.
CONDITIONS FOR RUNNING THE DTC
^ The ignition is on.
^ System voltage between 9.0 and 18.0 volts.
CONDITIONS FOR SETTING THE DTC
^ An improper voltage level has been detected on the alternator lamp driver circuit.
^ Above conditions for at least 30 seconds.
ACTION TAKEN WHEN THE DTC SETS
^ The PCM will not illuminate the malfunction indicator lamp (MIL).
^ The PCM will store conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.
CONDITIONS FOR CLEARING THE MIL/DTC
^ A History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using a scan tool.
TEST
